12121893 has 20 divisors (see below), whose sum is σ = 20695840. Its totient is φ = 6926472.

The previous prime is 12121883. The next prime is 12121927. The reversal of 12121893 is 39812121.

It is not a de Polignac number, because 12121893 - 2¹² = 12117797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121873) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10123 + ... + 11256.

It is an arithmetic number, because the mean of its divisors is an integer number (1034792).

Almost surely, 2^12121893 is an apocalyptic number.

It is an amenable number.

12121893 is a deficient number, since it is larger than the sum of its proper divisors (8573947).

12121893 is an equidigital number, since it uses as much as digits as its factorization.

12121893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21398 (or 21389 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 12121893 is about 3481.6509015121. The cubic root of 12121893 is about 229.7154199296.

The spelling of 12121893 in words is "twelve million, one hundred twenty-one thousand, eight hundred ninety-three".